Question

10- Coding Style 15 - Compilation 10 - Makefile with default, clean, and run rules 05 - Code is warning free 75- Implementation 05 pts - Deals correctly with missing arguments 05 pts Handles missing files well 15 pts - Files dealt with correctly 10 pts - Correctly handles uppercase text 10 pts - Correctly handles lowercase text 10 pts - Correctly handles mixed-case text 10 pts Correctly handles punctuation and whitespace 10 pts - Shifting works both ways. Meaning a shift value of 3 and -3 should give you the same result.

i want to implement a caesae cypher program in C given input.txt to be cyphered.

for example. assume the file input.txt contains

'THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG'

when i run $./cypher input.txt 3 on terminal

we get out put of

'WKH TXLFN EURZQ IRA MXPSV RYHU WKH ODCB GRJ'

Answer 1

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int main(int argc,char *argv[])
{
   static int a[26];
   int i=0,j,m,key;
   char mes[100],res[100];
   char ch;
   FILE *fp;
   key=atoi(argv[2]);
   fp=fopen(argv[1],"r");
   i=0;
   while ( 1 )
   {
       ch = fgetc ( fp ) ;
       if ( ch == EOF )
           break ;
       mes[i]=ch;
       i++;
   }
   //printf("%s",mes);
   fclose(fp);
   for(i=0;mes[i]!='\0';i++)
   {
       ch=mes[i];      
       if(ch>='a' && ch<='z')
       {
           ch=ch+key;
           if(ch>'z')
           {
               ch=ch-'z'+'a'-1;
           }
       }  
       else if(ch>='A' && ch<='Z')
       {
           ch=ch+key;
           if(ch>'Z')
           {
               ch=ch-'Z'+'A'-1;
           }
       }
       res[i]=ch;
   }
   printf("\n%s\n",res);

   return 0;
}

Activities Terminal ▼ Sun 12:58 PM Open- A cipher.c cipher.c output.txt #include«string.h> #include int nain(int argc,char sagar@sagar-HP-EliteBook-840-G1:- argv[]) File Edit View Search Terminal Help sagar@sagar-HP-EliteBook-840-G1:- gcc cipher.c -o cipher sagar sagar-HP-EliteBook-840-G1./cipher input.txt static int a[26]: int i-0,j,m,key; char mes[100],res[100]; char ch; FILE *fp; key-atoi (argv[2]); fp-fopen(argv[1],"r" L-0; WKH TXLFN EURZQ IRA MXPSV RYHU WKH ODCB GRJ sagar@sagar-HP-EliteBook-840-G1:-S while 1 ch fgetc ( fp ) ; break mes[i]-ch; //printf("s",nes) fclose(fp); ch-mes[i]; ch ch+key if (ch>'z') else if (ch 'A' && ch-'Z' ch-ch+key: if (ch>'z') res[i]=ch; Ln 38, Col35 INS